Scholars and students have always been great travellers. The official case for "academic mobility" is now often stated in impressive terms as a fundamental necessity for economic and social progress in the world, and debated in the corridors of Europe, but it is certainly nothing new. Serious students were always ready to go abroad in search of the most stimulating teachers and the most famous academies; in search of the purest philosophy, the most effective medicine, the likeliest road to gold.
Mobility of this kind meant also mobility of ideas l their transference across frontiers, their simultaneous impact upon many groups of people. The point of learning is to share it, whether with students or with colleagues; one presumes that only eccentrics have no interest in being credited with a startling discovery, or a new technique. It must also have been reassuring to know that other people in other parts of the world were about to make the same discovery or were
A. there are so many people working in similar fields
B. there is a lot of social unrest at universities
C. their follow experts are scattered round the world
D. their laboratories are in remote places
| It is often difficult for a man to be
quite sure what tax he 9ught to pay to the government be-cause it depends on so
many different things: whether the man is married; how many children he has;
whether he supports any relations; how much he earns; how much interest he
receives; how much he has spent on his house during the year, and so on and so
forth. All this makes it difficult to decide exactly how much the tax
is. There was a certain artist who was always very careful to pay the proper amount. One year, after posting his check as usual, he began to wonder if he had paid enough, and after a lot of work, with a pencil and paper, he decided that he had not. He believed that he owed the government something. He was just writing another check to send to the tax-collector when the postman dropped a letter into the box a A. To send him a new tax form. B. To return the money over-paid. C. To remind him of paying the tax. D. To explain the rules of tax-paying. [单选题]使用梯子时，放置角度以60度为宜，人字梯高度不得超过（ ）。
A.2.5米 B.3米 C.2米 [单项选择]许多协议都可以看作是完成了OSI参考模型中的一部分，CCITTX.21协议属于OSI协议中的第（）层。
A. 1 B. 2 C. 3 D. 4 [单选题]15m金属拉梯由()人操作。
A.3 B.4 C.5 D.6 [单选题]（类别：号段管理难度：中等）关于智慧数资产管理平台的七大模块构成，错误的是（）（）
A.数据感知平台 B.元数据管理平台与数据质量平台 C.大数据集群治理平台与数据标准适配管理平台 D.数据集成平台与数据开发平台 我来回答: 提交
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